433K accounts from Xbox-Scene (xboxscene.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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In approximately February 2015, the Xbox forum known as Xbox-Scene was hacked and more than 432k accounts were exposed. The IP.Board forum included IP addresses and passwords stored as salted hashes using a weak implementation enabling many to be rapidly cracked.
Source: Have I Been Pwned (CC BY 4.0)